initial commit

cmake/modules/InitializeSwift.cmake

@@ -0,0 +1,89 @@
+# This source file is part of the Swift open source project
+#
+# Copyright (c) 2023 Apple Inc. and the Swift project authors.
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+
+# Compute the name of the architecture directory on Windows from the CMake
+# system processor name.
+function(_swift_windows_arch_name output_variable_name target_arch)
+  if(NOT WIN32)
+    return()
+  endif()
+
+  if("${target_arch}" STREQUAL "AMD64")
+    set("${output_variable_name}" "x86_64" PARENT_SCOPE)
+  elseif("${target_arch}" STREQUAL "ARM64")
+    set("${output_variable_name}" "aarch64" PARENT_SCOPE)
+  else()
+    message(FATAL_ERROR "Unknown windows architecture: ${target_arch}")
+  endif()
+endfunction()
+
+# Compute flags and search paths
+# NOTE: This logic will eventually move to CMake
+function(_setup_swift_paths)
+  # If we haven't set the swift library search paths, do that now
+  if(NOT SWIFT_LIBRARY_SEARCH_PATHS)
+    if(APPLE)
+      set(SDK_FLAGS "-sdk" "${CMAKE_OSX_SYSROOT}")
+    endif()
+
+    # Note: This does not handle cross-compiling correctly.
+    #       To handle it correctly, we would need to pass the target triple and
+    #       flags to this compiler invocation.
+    execute_process(
+      COMMAND ${CMAKE_Swift_COMPILER} ${SDK_FLAGS} -print-target-info
+      OUTPUT_VARIABLE SWIFT_TARGET_INFO
+    )
+
+    # extract search paths from swift driver response
+    string(JSON SWIFT_TARGET_PATHS GET ${SWIFT_TARGET_INFO} "paths")
+
+    string(JSON SWIFT_TARGET_LIBRARY_PATHS GET ${SWIFT_TARGET_PATHS} "runtimeLibraryPaths")
+    string(JSON SWIFT_TARGET_LIBRARY_PATHS_LENGTH LENGTH ${SWIFT_TARGET_LIBRARY_PATHS})
+    math(EXPR SWIFT_TARGET_LIBRARY_PATHS_LENGTH "${SWIFT_TARGET_LIBRARY_PATHS_LENGTH} - 1 ")
+
+    string(JSON SWIFT_TARGET_LIBRARY_IMPORT_PATHS GET ${SWIFT_TARGET_PATHS} "runtimeLibraryImportPaths")
+    string(JSON SWIFT_TARGET_LIBRARY_IMPORT_PATHS_LENGTH LENGTH ${SWIFT_TARGET_LIBRARY_IMPORT_PATHS})
+    math(EXPR SWIFT_TARGET_LIBRARY_IMPORT_PATHS_LENGTH "${SWIFT_TARGET_LIBRARY_IMPORT_PATHS_LENGTH} - 1 ")
+
+    string(JSON SWIFT_SDK_IMPORT_PATH ERROR_VARIABLE errno GET ${SWIFT_TARGET_PATHS} "sdkPath")
+
+    foreach(JSON_ARG_IDX RANGE ${SWIFT_TARGET_LIBRARY_PATHS_LENGTH})
+      string(JSON SWIFT_LIB GET ${SWIFT_TARGET_LIBRARY_PATHS} ${JSON_ARG_IDX})
+      list(APPEND SWIFT_SEARCH_PATHS ${SWIFT_LIB})
+    endforeach()
+
+    foreach(JSON_ARG_IDX RANGE ${SWIFT_TARGET_LIBRARY_IMPORT_PATHS_LENGTH})
+      string(JSON SWIFT_LIB GET ${SWIFT_TARGET_LIBRARY_IMPORT_PATHS} ${JSON_ARG_IDX})
+      list(APPEND SWIFT_SEARCH_PATHS ${SWIFT_LIB})
+    endforeach()
+
+    if(SWIFT_SDK_IMPORT_PATH)
+      list(APPEND SWIFT_SEARCH_PATHS ${SWIFT_SDK_IMPORT_PATH})
+    endif()
+
+    # Save the swift library search paths
+    set(SWIFT_LIBRARY_SEARCH_PATHS ${SWIFT_SEARCH_PATHS} CACHE FILEPATH "Swift driver search paths")
+  endif()
+
+  link_directories(${SWIFT_LIBRARY_SEARCH_PATHS})
+
+  if(WIN32)
+    _swift_windows_arch_name(SWIFT_WIN_ARCH_DIR "${CMAKE_SYSTEM_PROCESSOR}")
+    set(SWIFT_SWIFTRT_FILE "$ENV{SDKROOT}/usr/lib/swift/windows/${SWIFT_WIN_ARCH_DIR}/swiftrt.obj")
+    add_link_options("$<$<LINK_LANGUAGE:Swift>:${SWIFT_SWIFTRT_FILE}>")
+  elseif(NOT APPLE)
+    find_file(SWIFT_SWIFTRT_FILE
+              swiftrt.o
+              PATHS ${SWIFT_LIBRARY_SEARCH_PATHS}
+              NO_CACHE
+              REQUIRED
+              NO_DEFAULT_PATH)
+    add_link_options("$<$<LINK_LANGUAGE:Swift>:${SWIFT_SWIFTRT_FILE}>")
+  endif()
+endfunction()
+
+_setup_swift_paths()